Gossamer Bio, Inc. — Director's Dealing 2021

Mar 1, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Gossamer Bio, Inc. (GOSS)
CIK: 0001728117
Period of Report: 2021-02-25

Reporting Person: Salter-Cid Luisa (Chief Scientific Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-02-25	Common Stock	A	45000	—	Acquired	211556	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-02-25	Stock Option (Right to Buy)	$9.79	A	90000	Acquired	2031-02-25	Common Stock (90000.0)	Direct

Footnotes

F1: Represents restricted stock unit award, which will vest in three equal annual installments in accordance with the terms of the award and subject to the Reporting Person's continuous service to the Issuer on each vesting date.

F2: Includes 32,641 shares subject to forfeiture, which shares will vest in equal monthly installments as set forth in the restricted stock agreement between the Issuer and Reporting Person so that all of the shares will be released from the forfeiture restriction on November 18, 2021, subject to the Reporting Person's continuous service to the Issuer on each such vesting date. Also includes 46,500 restricted stock units granted in February 2020, which shares will vest in three equal annual installments in accordance with the terms of the award and subject to the Reporting Person's continuous service to the Issuer on each vesting date.

F3: 25% of the total number of shares subject to the option will vest on February 25, 2022 and 1/48th of the total number of shares subject to the option vest on the last day of each one-month period thereafter, subject to the Reporting Person's continuous service to the Issuer on each such vesting date.